Q2 एक लेंस की क्षमता +2.5 डायोप्टर है । यह किस प्रकार का लेंस है? (1)
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power=+2.5 dioptre
p=1/f
f=1/p
f=1/2.5
f=0.4m
=40cm
so it is convex lens because it's value is positive
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